Update docs to generate Guru Meditation Report
Update docs to generate Guru Meditation Report

Guru Meditation Reports (GMR) code in oslo.reports was recently updated
to expect SIGUSR2 as opposed to SIGUSR1, because it is reserved by
Apache 'mod_wsgi' for its own use.

Signal was changed and merged in change:
I9d3b6079ba2cca41fe4723723a6f80b2c3c0b9c0

Change-Id: Id58dd3c32b095f4c6b14caf650d36f2fc7dfb12c

mahak/cinder,NetApp/cinder,cloudbase/cinder,Datera/cinder,Hybrid-Cloud/cinder,apporc/cinder,openstack/cinder,Hybrid-Cloud/cinder,NetApp/cinder,ge0rgi/cinder,mahak/cinder,dims/cinder,scality/cinder,phenoxim/cinder,scality/cinder,eharney/cinder,openstack/cinder,apporc/cinder,eharney/cinder,j-griffith/cinder,dims/cinder,Datera/cinder,j-griffith/cinder,Nexenta/cinder,bswartz/cinder,phenoxim/cinder,cloudbase/cinder,Nexenta/cinder,bswartz/cinder